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SIMMONS FIRST NATIONAL CORP

For the period ended Dec 31, 2025. Filed Feb 25, 2026.

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A company's yearly report to the SEC, with audited financial statements. It is the fullest account a company gives of its business, its finances and the risks it sees.

FY2025 · Filed Feb 25, 2026

SFNC$23.80+2.0%Stored close · as of Nov 9, 2026

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Contents

Item 9B. Other Information

Trading Arrangements

During the three months ended December 31, 2025, none of our directors or officers (as defined in Rule 16a-1(f) of the Securities Exchange Act of 1934, as amended)adopted, modified orterminated a Rule 10b5-1 trading arrangement or non-Rule 10b5-1 trading arrangement (as such terms are defined in Item 408 of Regulation S-K of the Securities Act of 1933).

Amended and Restated By-Laws

On February 25, 2026, the Company’s board of directors (“Board”) adopted amended and restated by-laws of the Company (“Amended and Restated By-Laws”), effective as of such date. In addition to certain technical and administrative revisions, the Amended and Restated By-Laws clarify the role and responsibilities of the Chairman and Vice Chairman of the Board in new Article III, Section 3 and remove the Chairman of the Board from the list of required officers of the Company in Article IV, Section 1.

The foregoing description of the Amended and Restated By-Laws does not purport to be complete and is qualified in its entirety by reference to the full text of the Amended and Restated By-Laws, a copy of which is attached as Exhibit 3.3 to this Annual Report on Form 10-K and is incorporated by reference herein.

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